31. An event horizon is ____ . 32. For an object falling towards the event horiz

Question

31. An event horizon is ____ .

32. For an object falling towards the event horizon, describe how and why does its shape change.

33. Dust and gas falling towards the black hole usually form an accretion disk – why?

34. Is there any radiation from the accretion disk around the black hole, and if so in what part of the spectrum?

35. A supernova is ______

36. Describe the physical differences of the two main types of supernovae.

37. Which one is useful for the distance determination, and why?

38. What have we learned about the way the Universe expands from the recent SN observations?

Explanation / Answer

Solution :- An event horizon can be defined as in spacetime has a boundary around it where no point of return is possible or no escape.It has that much strong gravitation pull force ,no one can enter into the specified region with boundary.

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